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Revenue Recognition - Additional Information (Details) | 6 Months Ended
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Dec. 01, 2018
Revenue Recognition [Line Items] |
Assurance product warranty period on parts | 30 days
Maximum |
Revenue Recognition [Line Items] |
Services revenue recognized as percentage of aggregate revenue | 5.00%
Extended product warranty period | 3 years
Minimum |
Revenue Recognition [Line Items] |
Extended product warranty period | 1 year

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- Definition Assurance product warranty period. + References No definition available. + Details
Name: | rell_AssuranceProductWarrantyPeriod
Namespace Prefix: | rell_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Extended product warranty period. + References No definition available. + Details
Name: | rell_ExtendedProductWarrantyPeriod
Namespace Prefix: | rell_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue recognition. + References No definition available. + Details
Name: | rell_RevenueRecognitionLineItems
Namespace Prefix: | rell_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Services revenue recognized as percentage of aggregate revenue. + References No definition available. + Details
Name: | rell_ServicesRevenueRecognizedAsPercentageOfAggregateRevenue
Namespace Prefix: | rell_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |